WO2003072368A1 - Film process d'impression, procede de fabrication correspondant, procede de recyclage de film process et imprimante - Google Patents

Film process d'impression, procede de fabrication correspondant, procede de recyclage de film process et imprimante Download PDF

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Publication number
WO2003072368A1
WO2003072368A1 PCT/JP2003/001729 JP0301729W WO03072368A1 WO 2003072368 A1 WO2003072368 A1 WO 2003072368A1 JP 0301729 W JP0301729 W JP 0301729W WO 03072368 A1 WO03072368 A1 WO 03072368A1
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WO
WIPO (PCT)
Prior art keywords
photosensitive layer
printing
printing plate
light
plate
Prior art date
Application number
PCT/JP2003/001729
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English (en)
Japanese (ja)
Inventor
Yasuharu Suda
Toyosi Ohto
Original Assignee
Mitsubishi Heavy Industries, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries, Ltd. filed Critical Mitsubishi Heavy Industries, Ltd.
Priority to DE60314994T priority Critical patent/DE60314994T2/de
Priority to EP03705288A priority patent/EP1479527B1/fr
Priority to US10/480,252 priority patent/US20040168597A1/en
Publication of WO2003072368A1 publication Critical patent/WO2003072368A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1041—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by modification of the lithographic properties without removal or addition of material, e.g. by the mere generation of a lithographic pattern
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N3/00—Preparing for use and conserving printing surfaces
    • B41N3/006—Cleaning, washing, rinsing or reclaiming of printing formes other than intaglio formes

Definitions

  • the present invention relates to a recyclable printing plate, a method for producing the same, a method for regenerating a printing plate, and a printing press.
  • anodized aluminum is used as a hydrophilic non-image area.
  • a so-called P 2 S plate (Presensitized Plate) having a hydrophobic image formed by curing a photosensitive resin on its surface has been generally used.
  • the production of a printing plate using this PS plate requires multiple steps, and therefore, the production of the plate takes time and costs are high, so the printing process time can be shortened and the printing process can be performed. It is difficult to promote cost reduction. In particular, when printing a small number of copies, this is a factor in printing costs.
  • the PS plate requires a developing process with a developer, and it takes time and effort, and the treatment of the developing waste liquid is an important issue from the viewpoint of preventing environmental pollution.
  • a method is generally used in which a film in which an original image is drilled is brought into contact with a plate surface for exposure, and printing is carried out to prepare a plate directly from digital data and to digitize a printing process.
  • the preparation of the version is an obstacle. The After printing one pattern, the plates had to be changed and the next printing had to be done, and the plates were disposable.
  • a laser absorbing layer such as a carbon black and the like and a silicon resin layer coated thereon are formed on a PET (polyethylene terephthalate) film, and the laser absorbing layer is heated by writing an image with a laser beam.
  • a method for directly writing an image from digital data to a PS plate with light is also proposed, for example, a writing device using a blue laser of 405 nm, a writing device using a micro mirror and a UV lamp, so-called CTP (Computer To Plate) is commercially available.
  • CTP Computer To Plate
  • Japanese Patent Application Laid-Open No. H10-25027 discloses a latent image plate using a titanium oxide photocatalyst, a method of manufacturing a latent image plate, and a printing apparatus having a latent image plate
  • Japanese Patent Application Laid-Open No. 11-147360 discloses an offset printing method using a plate material using a photocatalyst, and in any of these, it is possible to use light to activate the photocatalyst for image writing. That is, a method has been proposed in which the plate is regenerated by hydrophobizing the photocatalyst by heat treatment substantially using ultraviolet light.
  • JP-A-11-125324 discloses a method of preparing a lithographic printing plate, in which a photocatalyst is hydrophilized with active light, that is, an ultraviolet ray, and then an image is drawn by heat mode drawing. A method for writing a department has been proposed.
  • the present inventors have been able to rapidly write an image on a printing plate with a writing device using light having a wavelength lower than visible light, and reproduce the printing plate quickly after printing.
  • a keen research was conducted on a recyclable printing plate material, a method of producing the printing plate material, and a method of regenerating the printing plate. According to this study, it is necessary to hydrophilize the surface of the printing material when writing the image on the printing material or erasing the image data when reproducing the printing material. How quickly the surface is made hydrophilic has become an important issue.
  • the present invention has been made in view of the above-mentioned problems, and enables reproduction of a printing material so that it can be used repeatedly, shortening of the image writing time occupied in the printing process, and shortening of the printing time. It is an object of the present invention to provide a printing plate, a method for producing the printing plate, a method for regenerating the printing plate, and a printing press. Disclosure of the invention
  • the present invention takes the following measures in order to solve the above-mentioned problems.
  • the printing plate material of the present invention writes an image with light having a wavelength equal to or less than visible light, enables plate preparation without wet development processing, and can be used to print plates repeatedly.
  • a photosensitive material a substrate, a photosensitive layer provided on the surface of the substrate and containing a photocatalyst responsive to light having a wavelength of visible light or less, and an intervening material between the substrate and the photosensitive layer And an intermediate layer containing a semiconductor or an electrical conductor.
  • the photocatalyst of the present invention which has effective energy to cause it to exhibit catalytic activity, is referred to as active light including the visible light and light having a wavelength less than visible light.
  • the entire surface of the printing plate can be made hydrophilic by irradiating the entire surface of the printing plate with active light less than visible light.
  • the organic compound When an organic compound is coated on the surface of the photosensitive layer, the organic compound can be oxidized and decomposed.
  • the intermediate layer interposed between the substrate and the photosensitive layer contains a semiconductor or an electrical conductor
  • the nature of the semiconductor or the electrical conductor makes it possible to write an image by active light.
  • the writing speed can be increased to shorten the plate making time, and the light energy required to write the image can be reduced.
  • the image writing time and the plate reproduction time can be shortened, and furthermore, the print preparation time can be shortened.
  • the amount of printing material discarded after use can be significantly reduced, and costs related to the printing material can be reduced.
  • plate preparation and plate regeneration can be performed, and the operability can be improved without plate replacement work.
  • the substrate preferably has flexibility.
  • the printing plate material can be stuck on the cylindrical plate cylinder, and can be appropriately functioned as the printing plate material.
  • the intermediate layer preferably comprises tungsten oxide as a semiconductor. As a result, the reaction on the surface of the printing plate can be surely promoted, and the reduction of time required for plate making and plate reproduction can be surely realized.
  • the characteristics of the surface of the photosensitive layer be converted from hydrophobic to hydrophilic when irradiated with light having a wavelength of the visible light or less.
  • image writing is performed by converting the surface of the photosensitive layer from hydrophobicity to hydrophilicity by irradiating the surface of the photosensitive layer with active light of visible light or less, thereby promoting the hydrophilization of the semiconductor or the electric conductor. Images can be written quickly using the nature.
  • energy flux such as light, electricity, heat is irradiated to the surface of the printing material, or mechanical stimulus such as friction is applied to the surface of the printing material.
  • the characteristics of the surface of the photosensitive layer be converted from hydrophilic to hydrophobic. This makes it possible to hydrophobize the surface of the printing plate after printing and return the printing plate to its initial state.
  • the organic compound When an organic compound is supplied to the surface of the photosensitive layer at the time of reproduction of the plate material, the organic compound interacts with the photosensitive layer to make the characteristics of the surface of the photosensitive layer from hydrophilic to hydrophobic. Preferably, it is converted. Thereby, at the time of reproduction of the printing plate, by supplying an organic compound to the surface of the photosensitive layer, the organic compound interacts with the photosensitive layer to convert the characteristics of the surface of the photosensitive layer from hydrophilic to hydrophobic. Since the printing plate surface can be hydrophobized after printing, the printing plate can be returned to its initial state.
  • the photocatalyst is preferably a titanium oxide photocatalyst or a titanium oxide photocatalyst reformate.
  • the titanium oxide photocatalyst modified product refers to a titanium oxide photocatalyst based on doping or supporting a metal element or non-metal element other than the element originally contained in the titanium oxide photocatalyst, or titanium oxide light
  • the ratio of the Ti element to the O element of the catalyst is a stoichiometric ratio, ie, 1 to 1 Ti atom It means something which is shifted from the ratio of oxygen atom 2 and so on. This ensures that the above-mentioned conversion between hydrophobicity and hydrophilicity can be carried out.
  • the light having a wavelength of less than or equal to visible light described above preferably has a wavelength of less than or equal to 600 nm. That is,
  • the visible light refers wavelength 4 0 0 11 preferably 1 1 1 to 6 0 O nm light, more preferably wavelengths 4 0 0 eta [pi! It is light of ⁇ 500 nm. Therefore, light having a wavelength of visible light or less is preferably light having a wavelength of 60 O nm or less, more preferably light having a wavelength of 500 nm or less. This can broaden the light options available for the writing device.
  • an image is written by light having a wavelength equal to or less than visible light, and a plate can be produced without wet development, and the plate can be repeatedly regenerated and used.
  • Intermediate layer forming step of forming an intermediate layer containing a semiconductor or an electric conductor on a substrate surface, and an intermediate layer fixing step of fixing the intermediate layer on the substrate surface.
  • an image is written by light having a wavelength equal to or less than visible light, and a plate can be produced without wet development, and the plate can be repeatedly regenerated and used.
  • a sol coating method or a sputtering method can be used, and in each of the above-described fixing steps, for example, drying or baking can be used to fix each layer. This makes it possible to produce a printing plate. Ru.
  • the method for regenerating a printing plate according to the present invention is a method for regenerating a printing plate composed of the above-mentioned printing plate material, and after the completion of printing, removing ink from the surface of the printing plate; And a hydrophobicizing step of hydrophobizing the surface of the photosensitive layer.
  • the printing plate can be reproduced.
  • a hydrophilization step of irradiating the surface of the photosensitive layer with light having a wavelength smaller than visible light to hydrophilize the surface of the photosensitive layer is provided between the ink removing step and the hydrophobizing step.
  • the hydrophobing step is a step of irradiating the surface of the photosensitive layer with an energy flux of light, electricity, heat, etc., and a mechanical stimulus such as friction is exposed to light. It is preferable to include any one of the step of adding to the layer surface, and the step of supplying an organic compound to the surface of the photosensitive layer to cause the organic compound to interact with the surface of the photosensitive layer. This makes it possible to make the printing plate surface hydrophobic.
  • a printing press comprises: a plate cylinder for supporting the above-mentioned printing plate material on its peripheral surface; an image writing device for writing an image by irradiating the surface of the photosensitive layer with light having a wavelength of visible light or less. And a hydrophobization device for hydrophobizing the surface of the photosensitive layer.
  • the hydrophobization device has the function of irradiating energy, such as light, electricity, heat, etc., to the surface of the photosensitive layer, and the function of applying mechanical stimulation, such as friction, to the surface of the photosensitive layer, and organic compounds It is preferable to have any one of the functions of supplying the organic compound to the surface of the photosensitive layer to cause the organic compound and the surface of the photosensitive layer to interact with each other.
  • the surface of the printing plate can be hydrophobized by various methods to return the printing plate to its initial state.
  • the whole surface of the plate material is irradiated with light having a wavelength of visible light or less to eliminate the history of the surface of the plate material. As a result, since the history of the surface of the printing plate can be eliminated, the printing plate can be regenerated by hydrophobizing the surface of the printing plate thereafter.
  • FIG. 1 is a schematic cross-sectional view in the case where the surface of the printing plate of the printing plate according to one embodiment of the present invention exhibits hydrophobicity.
  • FIG. 2 is a schematic cross-sectional view in the case where the surface of the printing plate of the printing plate according to one embodiment of the present invention exhibits hydrophilicity.
  • FIG. 3 is a diagram showing a cycle from image writing to reproduction of a printing plate according to an embodiment of the present invention.
  • FIG. 4 is a schematic perspective view showing an example of a printing plate according to an embodiment of the present invention.
  • FIG. 5 is a graph showing the relationship between the time (or operation) according to an embodiment of the present invention and the contact angle of water on the surface of the printing plate.
  • FIG. 6 is a schematic view showing a printing press that performs printing and plate reproduction according to an embodiment of the present invention.
  • FIG. 7 is a flow chart for explaining the preparation and reproduction of a plate according to an embodiment of the present invention.
  • FIG. 8 is a flowchart for explaining the preparation of a printing plate according to an embodiment of the present invention.
  • FIG. 1 and 2 show a printing plate material according to an embodiment of the present invention
  • FIG. 1 is a schematic cross-sectional view of the case where the surface of the printing plate shows hydrophobicity
  • FIG. 2 is a schematic cross-sectional view of the case where the surface of the printing plate shows hydrophilicity.
  • the printing plate 5 is basically composed of a base 1, an intermediate layer 2 and a photosensitive layer 3.
  • the printing plate material 5 is also simply referred to as a plate material, and the plate material having a printing image portion formed on the surface is referred to as a plate.
  • the substrate 1 is made of a metal such as aluminum or stainless steel, a polymer film or the like. However, it is not limited to metals such as aluminum and stainless steel or polymer films.
  • a layer containing a semiconductor or an electrical conductor is used as the intermediate layer 2 formed on the surface of the substrate 1.
  • an oxide semiconductor such as zinc oxide Z n O, tin oxide S n O, or oxidized tungsten tungsten 3 is preferable.
  • the method of forming the intermediate layer 2 with these semiconductors themselves is preferable, it is also possible to form semiconductor fine particles with another binder substance to form the intermediate layer 2.
  • oxides such as I T O (oxide of indium and tin), metals such as aluminum, silver and copper, carbon black, and conductive polymers can be used.
  • the intermediate layer 2 may be formed of these electric conductors themselves, or fine particles of an electric conductor may be formed of another pinda material to form the intermediate layer 2.
  • the intermediate layer 2 containing such a semiconductor or electrical conductor accelerates the writing speed at the time of image writing with light having a wavelength equal to or less than visible light, shortens plate making time, and reduces light energy required for image writing. It is possible to reduce the irradiation energy of the active light irradiated to the plate surface to eliminate the history when reproducing the plate. The reason for this is presumed to be that the semiconductor or electrical conductor constituting the intermediate layer 2 enhances the function of the photocatalyst contained in the photosensitive layer 3 described later.
  • silica Si 0 2
  • silicon down resin, reinforcing layer made of a silicon compound such as silicon rubber may be provided.
  • the reinforcing layer is formed to ensure adhesion between the substrate 1 and the intermediate layer 2 and to improve adhesion.
  • silicone alkyd, silicone urethane, silicone epoxy, silicone acrylic, silicone polyester, etc. are used as silicone resin.
  • the reinforcing layer may not be provided.
  • a photosensitive layer 3 including a titanium oxide photocatalyst as a photocatalyst is formed on the intermediate layer 2. That is, the surface of the photosensitive layer 3 exhibits high catalytic activity by being irradiated with activating light having energy higher than the band gap energy of the photocatalyst.
  • One of the features of the printing plate material 5 according to the present embodiment is light having a wavelength equal to or less than visible light having a wavelength of 600 nm (that is, active light having visible light having a wavelength of 400 to 600 nm That is, the photosensitive layer 3 is formed including a photocatalyst that responds to at least one of ultraviolet rays having a wavelength of 400 nm or less.
  • the photosensitive layer 3 surface becomes highly hydrophilic, or the photosensitive layer 3 surface is organic.
  • the organic compound is subjected to an oxidative decomposition reaction. The details of this organic compound will be described later.
  • the photocatalyst does not exhibit photocatalytic activity unless it is irradiated with light having energy higher than the band gap energy.
  • the original titanium oxide photocatalyst has a band gap energy of 3 eV, so it responds only to ultraviolet rays with a wavelength of 3800 nm or less.
  • the present invention responds to active light having a wavelength of 600 nm or less including visible light having a wavelength larger than that of ultraviolet light.
  • Photocatalyst is used.
  • the actinic light having a wavelength of 600 nm or less also includes an ultraviolet ray, but in the photocatalyst of the present invention, the actinic light may or may not contain ultraviolet light, that is, Even when only visible light of about 0 nm to 400 nm is included, the photocatalyst responds similarly.
  • a well-known method may be used as a method of producing a photocatalyst that responds to light in the visible light region.
  • a visible light responsive photocatalyst doped with nitrogen atoms is disclosed in Japanese Patent Application Laid-Open No. 2001-2020, and another application is disclosed in Japanese Patent Application Laid-Open No. 2001-202014.
  • a visible light responsive photocatalyst doped with chromium atoms and nitrogen atoms is disclosed.
  • Japanese Patent Application Laid-Open No. 11-172 5 12 discloses a visible light responsive photocatalyst in which metal ions such as chromium are ion-implanted.
  • visible light responsive photocatalysts using low temperature plasma and visible light responsive photocatalysts loaded with platinum have been published.
  • a visible light responsive photocatalyst prepared by the known method may be used.
  • a photosensitive layer containing a visible light responsive photocatalyst also referred to as a photocatalyst layer since the photosensitive layer contains a photocatalyst
  • a photosensitive layer containing a visible light responsive photocatalyst also referred to as a photocatalyst layer since the photosensitive layer contains a photocatalyst
  • the following substances may be added. That is, for example, silicic compounds such as silica, silica sol, organosilane, silicone resin, metal oxides or metal hydroxides such as zirconium, aluminum and titanium, and fluorine resins can be mentioned. .
  • the titanium oxide photocatalyst includes rutile type, anatase type and bruckite type, but any of them can be used in this embodiment, and a mixture of these may be used, but in consideration of photocatalytic activity, the anatase type is preferable. preferable.
  • the particle diameter of the titanium oxide photocatalyst be smaller to a certain extent.
  • the particle diameter of the titanium oxide photocatalyst is preferably not more than 0.2 ⁇ , more preferably not more than 0.50 ⁇ m.
  • titanium oxide photocatalyst is suitable as the photocatalyst, it is of course not limited to this.
  • the thickness of the photosensitive layer 3 is preferably in the range of 0.50 to 1 m.
  • the film thickness is too small, it is difficult to make full use of the above-mentioned properties, and if the film thickness is too large, the photosensitive layer 3 is easily cracked, which causes a decrease in printing durability. It is. Since this crack is remarkably observed when the film thickness exceeds 10 ⁇ m, it is necessary to recognize 10 m as the upper limit even if the above range is relaxed. Also, in practice, it is more preferable to set a film thickness of about 0.5 to 0.5 ⁇ m.
  • the coating solution used therein may include the titanium oxide photocatalyst, the strength of the photosensitive layer 3, and the various types mentioned above for improving the adhesion between the substrate 1 and the photosensitive layer 3.
  • solvents, crosslinking agents, surfactants etc. may be added.
  • the coating solution may be of a normal temperature drying type or a heat drying type, but the latter is more preferable.
  • the reason is that increasing the strength of the photosensitive layer 3 by heating is advantageous for improving the printing durability of the printing plate 5.
  • it is possible to produce a photosensitive layer 3 having high strength by growing an amorphous titanium oxide layer on a metal substrate by sputtering or the like in vacuum and then performing crystallization by heat treatment or the like. It is.
  • the hydrophilic surface is covered with a chemical reaction or physical adhesion with at least a hydrophilic portion of the surface of the printing plate 5 (surface of the plate), and the photosensitive layer 3 surface is Besides having the function of converting to hydrophobic, at the same time, it can be easily separated by the oxidative decomposition of the photocatalyst under active light radiation.
  • organic titanium compounds, organic silane compounds, isocyanato compounds and epoxide compounds are preferable.
  • Examples of the above organic titanium compounds include: 1) alkoxy titanium such as tetra-i-propoxytitanium, tetra-n-propoxytitanium, tetra-n-butoxytitanium, tetra-titanium i-butoxytitanium, tetrastearooxytitanium, and 2) tri) Titanium assylates such as n-butoxytitanium stearate, isopropoxytitanium tristearate, 3) Diisopropoxytitanium bisacetyl acetonate, dihydroxy 'bislatatatitanium, titanium one i ati Titanium chelate such as propoxy oxatyrenalole, Etc.
  • alkoxy titanium such as tetra-i-propoxytitanium, tetra-n-propoxytitanium, tetra-n-butoxytitanium, tetra-titanium i-but
  • organic silane compounds 1) trimethylmethoxysilane, tetramethylethoxysilane, dimethyl jetoxysilane, methyltrimethoxysilane, methylmethoxysilane, tetramethoxysilane, methyltriethoxysilane, tetraethoxysilane, methyldimethoxysilane, decadecyltrimethoxysilane, Alkoxysilanes such as octadecyltriethoxysilane 2) Trimethyl black silane, Dimethinodichlorosilane, methinoletrichlorosilane, Methyl ⁇ dichlorosilane, chlorosilanes such as dimethinole chlorosilane, etc.
  • isocyanate compound dodecyl isocyanate, isocyanate There is acid occluder etc.
  • epoxide compounds there are 1, 2-epoxydecane, 1, 2-epoxyhexanone, 1, 2-epoxy decadecane and the like.
  • the organic titanium compound, the organic silane compound, the isocyanate compound and the epoxide compound are not limited to the above-mentioned substances.
  • the above organic compounds may be applied to the photosensitive layer 3 by methods such as pre-coating, mouth coating, dip coating, etc.
  • step S 2 It consists of 2 4 0) steps.
  • “preparation of plate” means that at least a part of the surface of plate 5 is converted to digital data from the state (initial state) in which the surface of plate 5 (that is, the surface of photosensitive layer 3) is hydrophobized Based on this, light having a wavelength below visible light (active light) is irradiated to form a hydrophilic non-image area, which is combined with the hydrophobic part of the surface of the printing plate 5 which has not been irradiated with active light. To form a latent image consisting of a hydrophobic image area and a hydrophilic non-image area.
  • step S 2 0 0 the pre-process [hydrophilization process (step S 2 0 0)
  • the surface of the photosensitive layer 3 of which the entire surface has been hydrophilized in step S2400)] is hydrophobized.
  • Step (a) in FIG. 3 shows the initial state in which the entire surface of the printing plate 5 is hydrophobized.
  • the surface of the hydrophobic printing material 5 is the surface of the printing material 5 whose contact angle of water 6 is 50 ° or more, preferably 80 ° or more, and the hydrophobic ink for printing is easily attached
  • the adhesion of dampening water is in a difficult state.
  • this state of the surface of the photosensitive layer 3 is referred to as "initial state at the time of plate preparation”.
  • This "initial state at the time of plate preparation” may be regarded as the start time of the actual printing process (step S 220). More specifically, for any image, digitized data is already prepared and it can be regarded as the state when trying to write it on the surface of the printing plate 5.
  • step S 210 a non-image portion is written on the surface of the photosensitive layer 3 in the hydrophobic state as an image writing step (step S 210).
  • the non-image portion is written on the surface of the photosensitive layer 3 in accordance with the digital data on the image so as to correspond to the data.
  • the non-image area is a hydrophilic area where the contact angle of water 6 is 10 ° or less, and dampening water easily adheres, while the printing ink Adhesion is in a difficult state.
  • the photosensitive layer 3 As a method of revealing this hydrophilic non-image area based on image data, light having a wavelength of 600 nm or less, ie, active light is applied to the photosensitive layer 3 containing a photocatalyst that exhibits catalytic activity by active light.
  • the surface of the photosensitive layer 3 is hydrophilized by the action of the photocatalyst by irradiation.
  • the surface of the photosensitive layer 3 which has not been irradiated with the active light remains hydrophobic, a hydrophilic portion and a hydrophobic portion are formed on the plate surface, and a plate can be produced.
  • a non-image area is written by a writing head using visible light, for example, a violet laser with a wavelength of 405 nm, to form a hydrophobic photosensitive layer 3.
  • a non-image portion is formed on the surface.
  • the UV-Setter 710 published by basys Print (Germany) has a wavelength of 360 nm 450 nm.
  • a writing head using a light source for generating light and a micro mirror may be used as long as the image can be written using active light.
  • step S 210 At the end of the above image writing step (step S 210), as shown in step (c) in FIG. 3, an image area and a non-image area are formed on the surface of the photosensitive layer 3.
  • Printing in the next printing process (step S 220) is possible.
  • the surface of the printing plate 5 is coated with a so-called emulsified ink which is a mixture of a dampening water and a hydrophobic ink for printing and dampening water.
  • the shaded portion (that is, the hydrophobic image portion) 3b shows a state in which the hydrophobic ink is attached.
  • the dampening water preferentially adheres to the remaining white area (that is, the hydrophilic non-image area) 3a, while the hydrophobic ink is repelled and does not adhere. .
  • the image (pattern) coming up in this way the surface of the photosensitive layer 3 has a function as a printing plate. After that, the normal printing process, that is, printing on paper is executed, and the printing is finished.
  • production of plate means that at least a part is hydrophobic.
  • the surface of the printing plate 5 in which the remaining part exhibits hydrophilicity is uniformly hydrophilized on the entire surface
  • the surface of the printing plate 5 is treated with an energy flux of light, electricity, heat, etc. singly or in combination.
  • an energy flux of light, electricity, heat, etc. singly or in combination.
  • applying mechanical stimulation such as friction to the surface of the plate 5, or supplying an organic compound to the surface of the plate 5 to cause the photosensitive layer 3 and the organic compound to interact with each other. It refers to converting photocatalytic properties from hydrophilic to hydrophobic and restoring them again to the initial state of plate preparation.
  • step S 230 the photosensitive layer after printing is completed
  • the removal method there is a method of stopping the ink supply to the printing surface and reducing printing, a method of wiping the printing surface with a cloth-like tape winding mechanism, a roller coated with a cloth-like material for ink wiping.
  • a method of wiping the ink on the printing plate, a method of spraying the washing liquid on the printing plate with a spray and washing the ink may be used as appropriate.
  • step S 24 0 the entire surface of the photosensitive layer 3 is irradiated with activating light to hydrophilize the image area 3 b as well.
  • the entire surface of the photosensitive layer 3 can be made hydrophilic with a contact angle of water 6 of 10 ° or less. That is, the entire surface of the photosensitive layer 3 can be brought into the state shown in FIG. 2, and all the image history can be erased.
  • the property that a hydrophobic image portion existing on the surface of the photosensitive layer 3 is converted to a surface having high hydrophilicity by irradiation with active light can be achieved, for example, by using a titanium oxide photocatalyst.
  • the ultraviolet ray irradiation is used to convert the hydrophobic image area into hydrophilicity by using an ultraviolet lamp, and the entire surface of the photosensitive layer 3 is made hydrophilic, and the printing plate history Shows the case of eliminating
  • step S 2 0 0 the surface of the printing plate 5 is irradiated with a bundle of light, electricity, heat, etc. singly or in combination, or mechanical stimulation such as friction is
  • the hydrophilization step (step S 240) is added as one of the steps to completely eliminate the history of the printing plate, but in the ink removing step (step S 230), it adheres to the printing plate surface If the removed ink is sufficiently removed at least to the extent that it does not affect the next printing, skip this hydrophilization step (step S 240) and start the hydrophobicity from the ink removal step (step S 230). It may be moved directly to the conversion process (step S 2 0 0).
  • FIG. 5 It is the graph shown in FIG. 5 that shows what was explained above collectively.
  • This is a graph in which the horizontal axis represents time (or operation) and the vertical axis represents the contact angle of water 6 on the surface of the printing plate 5, and the printing plate 5 in the present embodiment, the photosensitive layer 3 surface It shows how the contact angle of water 6 changes with time or operation.
  • the alternate long and short dash line indicates the contact angle of the non-image area 3a of the photosensitive layer 3
  • the solid line indicates the contact angle of the image area 3b.
  • the surface of the photosensitive layer 3 is irradiated with active light so that the contact angle of water 6 on the surface of the photosensitive layer 3 exhibits high hydrophilicity of 10 ° or less.
  • step S 2 0 0 step A shown in FIG. 5
  • an energy flux such as light, electricity, heat, etc. is applied singly or in combination to the surface of the photosensitive layer 3.
  • Irradiating, applying a mechanical stimulus such as friction to the surface of the printing plate 5, or supplying an organic compound to the surface of the printing plate 5 to cause the organic compound to interact with the photosensitive layer 3 Converts properties from hydrophilic to hydrophobic.
  • the contact angle of water 6 is preferably 50 ° or more, and more preferably 80 ° or more.
  • point at which the hydrophobization treatment is completed [point (b) in FIG. 5] is the “initial state of plate preparation”.
  • step S 210 step B shown in FIG. 5
  • writing of the non-image portion is started on the surface of the hydrophobic photosensitive layer 3 by active light (FIG. 5).
  • active light FOG. 5
  • step B active light
  • the surface of the photosensitive layer 3 which has not been irradiated with actinic light remains hydrophobic, so that the surface of the photosensitive layer 3 has non-irradiated portions which are not irradiated with hydrophobic light, and the irradiated portions which are irradiated with active light are hydrophilic. Since it becomes a non-image part, it can function as a plate.
  • step S 220 shown in FIG. 5 step S in FIG. 5 (c) printing ends)
  • step S 230 step D shown in FIG. 5
  • step D the ink, dirt, etc. on the surface of the photosensitive layer 3 are removed [time point (d) in FIG. 5].
  • step S 240 step E shown in FIG. 5
  • step E irradiation of active light to the surface of the photosensitive layer 3 is started [point (e) in FIG. 5].
  • the hydrophobic image area is converted to a hydrophilic non-image area by the action of the photocatalyst, and the entire surface of the photosensitive layer 3 returns to hydrophilic again.
  • step S 200 step A ′ shown in FIG. 5
  • the energy flux of light, electricity, heat, etc. is applied singly or in combination to the plate surface, or friction is applied.
  • Etc. or by supplying an organic compound to the surface of the printing plate 5 to cause the organic compound and the photosensitive layer 3 to interact with each other. ,)] “The initial state at the time of plate preparation” will be returned, and this printing plate 5 will be reused.
  • this printing machine 10 is centered on the plate cylinder 11 and around the plate cleaning device 12, the image writing device 13, the organic compound supply device 14 as a hydrophobization device 14, the plate surface heating device 15 , Active light irradiation device for hydrophilization treatment as history eliminating device 1 6 , Inking roller 17, dampening water supply device 18 and blanket cylinder 19.
  • the printing plate 5 is wound around the plate cylinder 11 and installed.
  • the plate reproduction process which has been performed by printing on the plate cylinder 11 as described above is performed as follows. It takes place as follows.
  • FIG. 6 shows the plate cleaning device 12 having a mechanism for wiping off the cloth tape for wiping off the ink as a single one-shot device, the present invention is not limited to this.
  • the plate cleaning device 12 is detached from the plate cylinder 11, and the entire surface of the plate is irradiated with actinic light by an activation light irradiation device 16 for hydrophilization treatment to hydrophilize the plate surface.
  • an activation light irradiation device 16 for hydrophilization treatment to hydrophilize the plate surface.
  • the active light light having a wavelength equal to or less than visible light, that is, light having a wavelength of 600 nm or less can be used.
  • active light may be irradiated while the plate surface is heated by the plate surface heating device 15.
  • the organic compound is supplied to the plate surface by the organic compound supply device 14 to cause the organic compound and the photosensitive layer 3 to interact with each other to make the surface of the printing plate 5 hydrophobic.
  • the roller coating device is shown in FIG. 6, it does not restrict to this.
  • the hydrophobization apparatus has been described as an apparatus for supplying an organic compound to the surface of the printing plate 5, it goes without saying that the surface of the printing plate 5 is irradiated with an energy flux of light, electricity, heat, etc. singly or in combination.
  • the apparatus may be configured as an apparatus for applying a mechanical stimulus such as friction to the surface of the printing plate 5.
  • the surface of the printing plate 5 may be heated by the plate surface heating device 15 after the organic compound is applied for the purpose of promoting the interaction between the organic compound and the plate surface.
  • Irradiate active light to write non-image areas ie, write an image on the printing plate.
  • the printing plate material 5 can be mounted on the printing press 10 with the printing plate 5 attached to the printing plate cylinder 11 of the printing press. According to this, it is possible to carry out continuous printing work without stopping the printing press 10 and without interposing the printing plate replacement work.
  • the printing plate material 5 is configured to be wound around the plate cylinder 11.
  • the printing plate material 5 is not limited to this. It is needless to say that a plate directly provided on one surface, that is, one in which the plate cylinder 11 and the printing plate 5 are integrally formed may be used.
  • the procedure of the plate preparation and the plate regeneration and the effects thereof are more specific than the inventors confirmed.
  • An example will be described by way of example.
  • the flow of manufacturing the printing plate 5 is as follows: intermediate layer formation step (step S 100), intermediate layer fixing step (step S 110), photosensitive layer liquid formation step (step S 1 2 0), and the steps of the photosensitive layer fixing step (step S 1 3 0).
  • 0.2 g of the photocatalytic powder was collected and uniformly spread on the bottom of a tightly closed Pyrex (R) glass cylindrical container (volume 500 mL). Next, after degassing the inside of the reaction vessel, it was replaced with high purity air. Then, after injecting acetone so that the concentration in the reaction vessel became 500 ppm, adsorption was carried out at 25 ° C. for 10 hours in the dark until reaching adsorption parallel. After that, it was irradiated with a blue LED (principal wavelength 47 O nm) made by Nichia Chemical, and the amount of acetone and carbon dioxide was traced by Shimadzu gas chromatograph. As a result, acetone disappeared in 25 hours of blue LED irradiation. generation of C0 2 which matches the stoichiometric ratio of the acetone was observed instead. That is, it was confirmed that the photocatalyst powder exhibited catalytic activity with light at a wavelength of 4 70 nm.
  • the photocatalyst powder was dispersed in ion exchange water to form a slurry having a solid content of 20% by weight.
  • the slurry was pulverized by a wet mill (trade name: Dinomill PI L OT) to obtain a photocatalyst dispersion. '
  • step S 100 1) Prepare a base material 1 made of Alkaline degreased and use it as a printing plate substrate. Then, as shown in FIG. 8, after the semiconductor coating solution X is dip-coated on the substrate in the intermediate layer forming step (step S 100), after being air-dried in the intermediate layer fixing step (step S 10).
  • the intermediate layer 2 was fixed by heating at 500 ° C. for 30 minutes. At this time, the thickness of the intermediate layer 2 was about 0. 07 / m, and as a result of analysis, the composition of the intermediate layer 2 was tungsten oxide WOa.
  • a liquid prepared by mixing the photocatalyst dispersion liquid and a titanium oxide coating agent TKC-301 manufactured by Tika Co., Ltd. in a weight ratio of 1: 8 is used as the intermediate layer 2.
  • Dip coating was performed on the provided plate substrate, and the photosensitive layer 3 was fixed on the surface of the intermediate layer 2 by heating at 350 ° C. in the photosensitive layer fixing step (step S130), to obtain a plate member 5.
  • the thickness of the photosensitive layer 3 at this time was about 0.1 mm.
  • the contact angle of water 6 was measured using a CA-W contact angle meter made by Kyowa Interface Science on the surface of the plate material 5, the contact angle was 8 °.
  • the above-mentioned plate material 5 exhibiting hydrophilicity was attached to a bench offset printing machine New Ace Pro of Alpha 1 Giken Co., Ltd., the hydrophobization treatment solution Y was applied to the plate surface by a spray, and dried with a hot air drier.
  • the printing plate 5 was once removed from the printing press, and the contact angle of the water 6 was measured with the contact angle meter to give a contact angle of 75 °, showing sufficient hydrophobicity, and the printing plate 5 was a printing plate. It was confirmed that it was in the initial condition at the time of preparation.
  • the scanning speed of the laser beam is 2 m by an image writer using a semiconductor laser with a wavelength of 405 nm, an output of 5 mW Z channel, and a beam diameter of 1 5 ⁇ .
  • Z seconds halftone dot images with a writing rate of 10% to 100% were written on the printing plate in 10% steps.
  • the contact angle of the water 6 on the surface of the printing plate 5 was measured with the contact angle meter after the writing was completed, the contact angle of the portion written by the semiconductor laser was 8 ° and the hydrophilic non-image part was not written. It was confirmed that the image area was hydrophobic with a contact angle of 75 °.
  • the hydrophobization treatment solution Y was applied to the plate surface by a spray, and dried with a hot air drier.
  • the contact angle of the water 6 was measured by the contact angle meter, the contact angle was 73 °, showing sufficient hydrophobicity, and the printing plate 5 returned to the “initial state at plate preparation”, and the plate It confirmed that reproduction was possible.
  • a substrate 1 made of stainless steel (SUS 3 0 1) with an area of 280 x 2 04 mm and a thickness of 0.1 mm without dip coating the semiconductor coating solution X onto the substrate.
  • the photosensitive layer 3 was formed on the printing plate substrate to obtain a printing plate 5.
  • the thickness of the photosensitive layer 3 at this time was about 0.1 ⁇ m.
  • the contact angle of water 6 was measured using a C ⁇ -W contact angle meter made by Kyowa Interface Science on the surface of the printing plate 5, the contact angle was 7 ° and showed sufficient hydrophilicity.
  • the surface of the printing plate 5 was hydrophobized in the same manner as in Example 1.
  • the contact angle of water 6 was measured by the contact angle meter, the contact angle was 74 °, indicating sufficient hydrophobicity.
  • an image writing device using a semiconductor laser with a wavelength of 405 nm, an output of 5 mW / channel, and a beam diameter of 15 ⁇ was used to scan the area on the printing plate at a traveling speed of 2 m / sec. I wrote a halftone image with an interval of 10% to 100%.
  • the contact angle of water 6 on the surface of the printing plate 5 was measured with the contact angle meter after completion of writing, the contact angle of the portion written by the semiconductor laser did not show sufficient hydrophilicity at 23 °.
  • Example 2 In the same manner as in Example 1, printing was started at a printing speed of 350 sheets Z, but even the non-image area where the ink was not supposed to adhere was still adhered to the non-image area, and the printed matter was dirty. As described above, the contact angle of the non-image area was not sufficiently lowered, and the hydrophilicity of the non-image area was insufficient, so it is considered that the ink adhered to the non-image area to some extent.
  • Tin oxide S n O fine particles (particle size of about 5 0 0 nm), becomes S i 0 2 sol (trade name Sno one Tex 20, Nissan Chemical) S n O / S i 0 2 of the solid content ratio 6 ⁇ 4 to The mixture was mixed to form a semiconductor coating solution X '.
  • the photocatalyst powder was dispersed in ion exchange water to form a slurry having a solid content of 20% by weight.
  • the slurry was pulverized by a wet mill (trade name: Dinomill PI L ⁇ ) to obtain a photocatalyst dispersion liquid.
  • a base material 1 made of stainless steel (S U S 3 0 1) having an area of 280 x 2 04 mm and a thickness of 0.1 mm was prepared and subjected to an alkaline degreasing treatment to obtain a printing plate substrate.
  • step S 100 After dip coating the semiconductor coating solution X ′ on the substrate in the intermediate layer forming step (step S 100), after air drying in the intermediate layer fixing step (step S 110), C. for 30 minutes to fix on a substrate to form an intermediate layer 2.
  • the thickness of the intermediate layer 2 at this time was about 0.09 ⁇ .
  • the intermediate layer 2 is a solution obtained by mixing the photocatalyst dispersion liquid and a titanium oxide coating agent TKC-301 manufactured by Tika, Inc. in a weight ratio of 1: 8. Then, the photosensitive layer 3 is fixed on the intermediate layer 2 by heating at 350 ° C. in the photosensitive layer fixing step (step S130). And The thickness of the photosensitive layer 3 at this time was about 0.1 m.
  • the contact angle of water 6 was measured on the surface of the printing plate 5 with a CA 1 W-type contact angle meter manufactured by Kyowa Interface Science, the contact angle was 8 °, indicating sufficient hydrophilicity.
  • 1,2-epoxyhexadecane (Wako Pure Chemical Industries, Ltd.) was dissolved in 9.9.7 g of a paraffin-based solvent (trade name: Isopar L, manufactured by Alexon Mobil) to prepare a hydrophobization treatment solution.
  • a paraffin-based solvent trade name: Isopar L, manufactured by Alexon Mobil
  • the line rate 10 0 to 10 0 0 0 in 10% steps on the printing plate I wrote a halftone image of.
  • the image writing method was a method of simultaneously writing a plate of dimensions 13 mm x 7 mm (mini picture 1) at a writing speed of 10 mini pictures per second.
  • the contact angle of water 6 on the surface of printing plate 5 was measured with the contact angle meter after the writing was completed, the contact angle of the portion written by the semiconductor laser was 8 ° and the non-image area of hydrophilic was not observed. It was confirmed that the image had a hydrophobicity with a contact angle of 85 °.
  • Printing was performed in the same manner as in Example 1, and printing was started. A halftone dot image could be printed on the sheet from the first sheet.
  • ink removal and hydrophilization by ultraviolet irradiation were performed in the same manner as in Example 1.
  • the contact angle was 8 °.
  • the hydrophobization treatment liquid ⁇ ' is vaporized with a neplizer and applied to a printing plate. After drying with a wind dryer, when the contact angle of water 6 on the printing plate was measured by the contact angle meter, the contact angle showed 86 °, and the printing plate member 5 It confirmed that it returned to ".
  • the surface of the substrate is dip-coated with a semiconductor coating solution ⁇ , and the substrate 1 made of stainless steel (SUS 3 0 1) having an area of 280 x 204 mm N and a thickness of 0.1 mm is simply subjected to an Al-Fly degreasing treatment.
  • the photosensitive layer 3 was formed on the printing plate substrate in the same manner as in Example 2 except that the printing plate substrate was used, and a printing plate 5 was obtained.
  • the thickness of the photosensitive layer 3 at this time was about 0.1 m.
  • the contact angle of water 6 was measured using a CA-W contact angle meter manufactured by Kyowa Interface Science Co., Ltd. on the surface of the printing plate 5, the contact angle was 7 ° and showed sufficient hydrophilicity.
  • the surface of the printing plate 5 was hydrophobized in the same manner as in Example 2.
  • the contact angle of water 6 was measured by the contact angle meter, the contact angle was 86 °, indicating sufficient hydrophobicity.
  • Example 2 halftone images were written at a writing speed of 10 mini pictures per second.
  • the contact angle of water 6 on the surface of the printing plate 5 was measured by the contact angle meter after the writing was completed, the contact angle of the written portion did not show sufficient hydrophilicity at 26 °.
  • the hydrophobicity was maintained at a contact angle of 85 °.
  • Example 2 In the same manner as in Example 2, printing was started at a printing speed of 350 sheets / hour, but even non-image areas to which ink was not supposed to adhere were also adhered with ink, and the printed matter was dirty.
  • the printing plate member 5 can not only be reutilized, but also have an effect of speeding up the cycle. That is, the catalytic activity of the photocatalyst can be enhanced by providing a layer containing a semiconductor or an electrical conductor, so-called intermediate layer 2, between the substrate 1 and the photosensitive layer 3 containing a photocatalyst. In other words, it doesn't take long to make the plate, reproduce the plate, or do it in any case. Therefore, it is possible to complete the entire printing process very quickly.
  • the amount of plate material 5 discarded after use can be significantly reduced.
  • a cleaning solution for cleaning the image area polymer at the time of plate regeneration is also unnecessary. Therefore, not only environment-friendly but also the cost of the printing plate 5 can be greatly reduced.
  • the intermediate layer 2 is formed on the surface of the substrate 1, the intermediate layer 2 is formed.
  • the intermediate layer fixing step is skipped to be transferred to the photosensitive layer forming step for forming the photosensitive layer 3.
  • the intermediate layer 2 may be formed on the surface of the substrate 1 and then the photosensitive layer 3 may be formed, and then the intermediate layer 2 and the photosensitive layer 3 may be simultaneously fixed on the substrate 1 by drying or baking. . -

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Catalysts (AREA)
  • Materials For Photolithography (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Rotary Presses (AREA)

Abstract

L'invention concerne un film process d'impression, son procédé de fabrication, un procédé de recyclage de film process et une imprimante. Une image est écrite au moyen d'une lumière présentant une longueur d'onde de lumière dans le visible et en dessous, un film process pouvant être préparé sans qu'il soit nécessaire de réaliser un traitement de développement humide. Ce film process peut être recyclé et réutilisé. Il comprend un substrat (1), une couche photosensible (3) disposée sur la surface du substrat (1) et contenant un catalyseur optique réagissant à une lumière présentant une longueur d'onde de lumière dans le visible et en dessous, ainsi qu'une couche intermédiaire (2) dotée d'un semi-conducteur ou d'un conducteur électrique et disposée entre le substrat (1) et la couche photosensible (3).
PCT/JP2003/001729 2002-02-27 2003-02-18 Film process d'impression, procede de fabrication correspondant, procede de recyclage de film process et imprimante WO2003072368A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE60314994T DE60314994T2 (de) 2002-02-27 2003-02-18 Drucker, druckplattenherstellungsverfahren, und druckplattenrecyclingverfahren
EP03705288A EP1479527B1 (fr) 2002-02-27 2003-02-18 Imprimante, procede de fabrication de plaques d'impression, et procede de recyclage de plaques d'impression
US10/480,252 US20040168597A1 (en) 2002-02-27 2003-02-18 Printing process film, manufacturing method thereof, process film recycling method, and printer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002051647A JP2003246156A (ja) 2002-02-27 2002-02-27 印刷用版材，その作製方法，印刷用版の再生方法及び印刷機
JP2002-51647 2002-02-27

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WO2003072368A1 true WO2003072368A1 (fr) 2003-09-04

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PCT/JP2003/001729 WO2003072368A1 (fr) 2002-02-27 2003-02-18 Film process d'impression, procede de fabrication correspondant, procede de recyclage de film process et imprimante

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Country Link
US (1) US20040168597A1 (fr)
EP (1) EP1479527B1 (fr)
JP (1) JP2003246156A (fr)
DE (1) DE60314994T2 (fr)
WO (1) WO2003072368A1 (fr)

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JP2003231371A (ja) * 2002-02-12 2003-08-19 Mitsubishi Heavy Ind Ltd 印刷用版材及び印刷用版材の再生再使用方法並びに印刷機
JP5537356B2 (ja) * 2009-10-14 2014-07-02 積水樹脂株式会社 光触媒、コーティング剤、内装材、及び光触媒の製造方法
CN105093825B (zh) * 2010-03-18 2020-01-10 深圳市中创绿印科技有限公司 印刷的改进或涉及印刷的改进
CN107571658B (zh) * 2017-09-19 2019-09-20 京东方科技集团股份有限公司 一种印刷版及其制作方法

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US6938546B2 (en) 2002-04-26 2005-09-06 Mitsubishi Heavy Industries, Ltd. Printing press, layered formation and making method thereof, and printing plate and making method thereof

Also Published As

Publication number Publication date
EP1479527A4 (fr) 2005-06-15
DE60314994D1 (de) 2007-08-30
DE60314994T2 (de) 2008-04-03
EP1479527A1 (fr) 2004-11-24
EP1479527B1 (fr) 2007-07-18
JP2003246156A (ja) 2003-09-02
US20040168597A1 (en) 2004-09-02

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